Shares of gun maker Smith & Wesson rose nearly 9% on expectations that the company will see a rise in sales. Gun sales in the US typically spike when Americans anticipate the government might pass tighter firearm regulation.

Shares in Oracle rose 2.7% after it reported higher-than-expected quarterly revenues, helped by a big rise in sales at its cloud business.

Total revenue in the three months to 31 May - Oracle's fourth quarter - fell 1% to $10.59bn, but this was better than analysts' forecasts of $10.47bn. Profit rose to $2.81bn, from $2.76bn a year earlier.